Update 2: Stephen J. Dubner blogs on this quote on Freakonomics. His message contains the following addendum which is an email from Paul Bloom:

Hi Stephen,

I just read your entry on the Freakonomics blog, and thought I should send a quick reply.

Yes, my remark about evil economists was a joke. This was perfectly clear at the talk and it’s clear if you watch the video, but not from the NYTimes article, unfortunately. After I make the remark and people laugh, I then say “To put it more fairly …,” and go on to make the point that economists tend to reason consequentially, and are less sensitive to other considerations such as taboo, disgust status quo bias, and so on. I actually think that economists are right to do so in general, and I’ve argued in particular that disgust is useless as a guide for moral behavior. So, no, I don’t think you’re evil!